The singer and actress captioned the photograph: ‘Just stretching out in my rubber corset. The joy of postpartum.’ She accompanied the text with a smiling emoji.

The singer was all kitted up in leggings, trainers and a workout jumper, and though we can’t actually see what this so-called ‘rubber corset’ looks like, it could be anything between Kim K-esque spanx and rib-high pants.

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The 38-year-old mother of three has been busy since welcoming her daughter; seven weeks after giving birth and she’s already relaunched her website and began working out again.

Birdie Mae was born on 19 March and is the couple’s second daughter. The pair are also parents to daughter Maxwell, six, and son Ace, five.

Jessica has been keeping her fans updated about what it’s like being a mum to three children, and she recently attracted some inadvertent controversy after she posted a photo of her expressed breast milk on Instagram.

She captioned a photo of her expressed milk: ‘This is what success feels like.’

Birdie Mae is the couple’s second daughter (Picture: @jessicasimpson)

Not everyone celebrated in her success, with some accusing the singer of causing offense to those unable to breastfeed their child.

One person commented: ‘Wouldn’t know. Could never do it,’ while another said: ‘What a great way to make others who can’t feel like failures. Think before you post.’

Many others, however, expressed their support.

Jessica has been very open about all aspects of her pregnancy – much to her fans’ delight (Picture: Jamie McCarthy/Getty)

One follower, echoing the thoughts of hundreds of others, wrote: ‘YES!!!! You’re so HUMAN!!! This is my favorite post ever!!! Thank you for helping normalise breastfeeding!!! One day, this fight to normalise will just be a memory!!!’

Weeks after she gave birth to Birdie, and Simpson admitted to PEOPLE that life as a mother of three wasn’t easy.

‘Three is challenging. We are trying to get into the groove and make sure all three kids are getting equal attention … it’s more than a full-time job right now, she admitted.

‘[Birdie] makes our family complete,’ she hastened to add. ‘Someone once told me to keep in mind that everything is a phase with infants and kids … trying to remember that fact and celebrate the small victories.’

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